LibJS: Convert Heap::allocate{,_without_realm}() to NonnullGCPtr

Author: https://github.com/linusg
Commit: 22089436ed
Pull-request: https://github.com/SerenityOS/serenity/pull/16498
Reviewed-by: https://github.com/trflynn89 ✅

Userland/Libraries/LibWeb/DOM/Attr.cpp

@@ -15,7 +15,7 @@ namespace Web::DOM {
 
 JS::NonnullGCPtr<Attr> Attr::create(Document& document, FlyString local_name, DeprecatedString value, Element const* owner_element)
 {
-    return *document.heap().allocate<Attr>(document.realm(), document, QualifiedName(move(local_name), {}, {}), move(value), owner_element);
+    return document.heap().allocate<Attr>(document.realm(), document, QualifiedName(move(local_name), {}, {}), move(value), owner_element);
 }
 
 JS::NonnullGCPtr<Attr> Attr::clone(Document& document)